Door for furnaces and the like.



PATENTED JUNE 9, 1908.

APPLICATION FILED JULY 9, 1907.

2 SHEETSSHEBT 1.

No. 890,175. PATENTED JUNE 9, 1908.

H. RIBS. DOOR FOR FURNACES AND THE LIKE.

APPLIOATION FILED JULY 9, 1907.

2 SHEETS-SHEET 2.

4 Z5 4 fl mw WW; J 1 w 7// 3% 1 M'fi'nesses LA (2. J/QQK/WF UNITEDSTATES PATENT OFFICE.

HANS RIBS, OF MUNICH, GERMANY.

DOOR FOR FURNACES AND THE LIKE.-

Application filed July 9,

.must shut in a perfectly air tight manner.

If the furnace door together with its closing bar made rlgid and pressedby means of some suitable device against the door frame,

I then owing to the high temperature of the furnace, and the consequentchanges in the shape of the door, and more particularly, of f the doorframe, the tight joint between these two parts is easily destroyed.

According to this invention the. above i drawback is obviated by makingthe furnace door flexible and also by connecting it to the closingdevice. by which it is pressed against i the door frame by yieldingpressure memhers. Owing to its fiexibilit y the door under the action ofthe interposed pressure memj hers, can compensate its own changes ofshape and follow the changes of shape of the 5 door frame, so that thejoint between the i door and its frame always remains perfect.

If a protective cover or shield is used on a furnace door of theimproved construction 1 with a view to rotecting the door as much aspossible against the heat, the cover orf shield is connected to thedoor, according to this invention in such a manner that its t changes ofshape are not transmitted to the 3 door. but are compensated for by theconnecting membels between the two parts. 5

The injurious influence of the ressure of furnace charges which, whentie furnace door is used for vertical or oblique furnace j tends todestroy the tight joint, is avoided i by the protecting shield beingconnected dii rect to the door closing device. whereby the pressureexercised by the furnace charge 011 I the shield is transmitted to therigid closing device.

Finally the furnace door according to this I invention is constructed insuch a manner 1 that it can be-closed at a distance. any pressure in theclosing device being taken up by Specification of Letters Patent.

' such a manner that the door Patented June 9, 1908.

Serial N0. 382,887.

the yielding pressure members between the door and the door fasteningdevice.

In the accompanying drawings which show a construction of the door for achamber furnace having an oblique hearth, Figure 1 shows the furnacedoor in front elevation,

Fig. 2 is a vertical longitudinal section on line 22 of Fig. 1, and Fig.3 a horizontal cross-section on line 33 of Fig. 2, and Figs. 1 1 and 5show on an enlarged scale in longitudinal and cross-section through thefurnace door the connection between the protecting shield and door bolt.

The door plate 2 used for closing the chamber 1 is supported by carryingbars 5 which are pivoted about a pin 3 in the door frame 4 and formedinto bolts, a tight joint being formed when the door is closedpreferably by means of a knife-edged member 6 and a- E packing ledge 7of the door frame a secured to the furnace masonry S.

The bars 5 (Fig. 1) which extend through the whole length of the door,are rigidly connected together by means of transverse distance pieces orbars 9 and angle irons 10, and arranged at such distances apart thatthey form a rigid closing member extending over the whole surface of thedoor. The bars 5 are provided with eyes 11 distributed uniformly overthe door, through which pass screw bolts 12 preferably adjustable fromthe outside, and carrying at the inner ends f pressure sprm-gs 13.

The door plate 2 is connected to the bars5 by lugs or angle members 11one arm of which is movable on the transverse members 9 for instance onthe two outer ones by means of longitudinal holes 15,

while their outer arms are secured to the door plate 2. The iron doorplate 2 is made so thin that it is easily distorted. when unusualpressure is applied to it. The springs 13 are adjusted by means of thescrews 12 in late 2 is uniformly forced away from the ars 5.

If the bars 5 are pressed by any unusual force against the door frame,the edges of the door are forced against the door frame 4 by means ofthe springs 13, but when the shape of the door frame changes the doorlate owing to its flexibility can easily adapt itself to the alteredshape of the door frame and also the flexibility of the door at oncecompensates for any change 1n its own shape due j to the action of thesprings. so that the joint between the door and the door frame remainsperfect.

When a protective shield is provided at the inner furnace door for keeing the incandescent furnace charge from the door plate 2, atransmission of the changes in the shape. of the shield to the doorplate is avoided by pivoting the shield at one end and connecting it atthe other end to'the door plate by means of links or like members.

' In the vertical furnace door illustrated the upper end of theprotective shield 16 is secured to the door plate 2 by means of anglelinks 20 about their spindle 22 without the door 1plate 2 being aflectedby the changes in thes ape of the i'otective shield.

Figs. 4 and 5 s ow a device by means of which the pressure of thefurnace charge on the furnace door constructed according to thisinvention is neutralized without affecting the door joint. To that endthe protective shield 16 is connected direct to the bars 5 by means ofbolts 23 which pass through the door plate 2 in a gas tight manner bymeans of stufling boxes or the like. The connection of the bolts 23 tothe bars 5 is preferably effected by means of sleeves 24 adjustable onpiiyot 18 while the lower end the transverse bolts 9, to which the bolts23 are secured in a suitable manner. For preventing the changes in theshape of the protective shield from exercising an injurious influence onthe joint between the door plate 2 and the bolts 23, the latter arepreferably connected to the shield in the manner shown in Fig. 2.

A tight joint between the bolts 23 and the door plate 2 is preferablymade in such a manner that, in the event of any lateral movements orrotation of the bolts about the transverse bolts 9, the joint remainsunaffected. To that end, a corru ated metal plate 25 is secured to thedoor p ate 2 at the point through which the bolts 23 pass. Thecorrugated late is'drawn out in the center to form a tu e having a slotformed in itand is tightly pressed by means of a clamp ring 26 againstthe bolt 23. In this way a joint which is flexible in every direction isobtained by means of the corrugated plate 25.

In coking and gas producing furnaces and gas retorts it is desirable tobe able to manipulate the door from a distance for the pur ose ofprotecting the attendants. If a rigi furnace door is fastened by handfrom a distance the closing device is liable to be subjected toexcessive strains in its individual members.

In the door according to this invention ner corrugated plates carried bythe door plate.

this is avoided by. the high pressures produced in the fastening devicebeing taken u by the inter osed sprin s 1-3 acting as bu fers. As willbe seen from Figs. 1-3, the free lower ends of the bars 5 are formed U-shaped and are rovided with teeth 27 with which, when t e door isclosed, engage toothed wheels 29 mounted on a common spindle 28supported in the frame 4. Between the toothed wheels 29 is mounted onspindle 28 the Worm wheel 30 engagin with a worm 31 sup orted in theframe 4. I the furnace door Illustrated the s indie 32 of the worm isdirected obliquely ownwards and made sufliciently long to enable thedoor to be operated at the desired distance from the furnace.

.When the door is closed, the bars 5 can be pressed against the furnaceby rotatin the spindle 32, for, instance by means of a and Wheel. Thepressure exercised on the bars 5 is transmitted by the s rings 13 to thedoor plate 2 in a gradual an umform manner, so

that the door is tightly pressed with its edge 6 against the frame 4.Owing to the gradual increase of pressure to which the door is subjectedthe teeth are not laced under severe strain whereby a reliab e furnacedoor is insured.

The securing of he door frame 4 to the furnace masonry 8 is preferablyeflected by means of transverse anchors 33 secured to the closing of thetop and bottom of the frame and anchored to the masonry by means ofanchor bolts.

What I -clai1n is: i 1.- In a door for furnaces and the like, -th

combination with a flexible door plate of a closing member and yieldingpressure members disposed between the door plate and the closin member.2. n a door for furnaces and the like, the combination with a closingmember of a flexible door plate connected to said member, and ofbrackets mounted on or near the .flexible door plate carried by the saidmember and of an inner rotective shield pivotally connected to saimember.

4. In a door for furnaces and the like, the combination with a closingmember and a flexible door plate carried thereby of an inn a door forfurnaces and the like, the

ner protective shield connected to said member by bolts passing tightlythrough the late. 11 a door for furnaces and the like, the

door

combination with a closing member and a flexible door plate carriedthereby of an inrotective shield connected to said member y boltspassing tightly through spring 6. In a door for furnaces and the like.the In testimony whereof I hereunto aflix my combination with a flexibledoor lplate (arsignature in the presence of two witnesses. ri d bvclocin member of teet 1 on :aid

9 P HAAb RIEs.

member and toothed wheels arranged on the 5 door frame and adapted toengage the teeth Witnesses:

on the closing member and to be operated ABRAHAM SCHLESINGER, from adistance. LoL'Is F. MUELLER.

